RTF / .DOC malware analysis — malicious · f3dd8b5e93efe205

MALICIOUS

RTF / .DOC

456.8 KB

MD5: 962acd1f6267f4d57a9e73af8c6fe007 SHA-1: 6f09e2819749db7c700b17ebda60dab4c5e0a38f SHA-256: f3dd8b5e93efe205f4b48f2ab1ed1ce6dce8156d95e32daecd97b06c161bc782

182 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1566.001 Spearphishing Attachment T1059.001 PowerShell T1203 Exploitation for Client Execution

The sample is an RTF document that contains an embedded OLE object, specifically related to the Equation Editor. Heuristics indicate a critical vulnerability, CVE-2017-11882, which is known to be exploited for arbitrary code execution. The presence of OLE object data and the ".bin" file suggests that the document is designed to drop and execute a secondary payload, likely a downloader or dropper, to further compromise the system.

Heuristics 5

Equation Editor OLE1 native payload — CVE-2017-11882 related critical CVE related CVE_2017_11882_RELATED

RTF decodes to an OLE1 Equation.3 embedded object whose native data is large and payload-like, and \objupdate requests automatic activation. This is the delivery shape used by Equation Editor RCE documents such as CVE-2017-11882/CVE-2018-0802, but the malformed MTEF record needed for exact attribution was not recovered.
Split hex Equation Editor ProgID + OLE object critical RTF_EQUATION_EDITOR

RTF embeds the Equation.3 ProgID as hex bytes near OLE object activation and splits the byte stream with whitespace or an ignorable RTF group. This is an Equation Editor OLE activation surface commonly used by CVE-2017-11882 / CVE-2018-0802 exploit documents.
\objupdate forces OLE activation high RTF_OBJUPDATE

RTF contains \objupdate — forces automatic OLE object instantiation when the document is opened, bypassing user interaction. Almost exclusively seen in Equation Editor exploit documents.
OLE object data medium RTF_OBJDATA

RTF contains 1 \objdata section(s) — embedded OLE objects
Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off000005f2.bin` `078d6d343f29ef2cef15e842f640758cd4f8cfec935923be5a845204995b36e4`	rtf-objdata-decoded	RTF \objdata at offset 0x5F2	233060 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 8.00, consistent with packed or encrypted content.

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